无法在PHP中移动数据

I'm encountering a problem where I can't upload my videos. It produce this error: Could not move data.

<?php

//phpunfo();
echo '<br />';
echo <<<_END
<div id = "sec1">
<h1>Video Upload</h1>
<br />
<form method='post' action='Upload.php' 
enctype='multipart/form-data'>
Select File: <input type='file' name='filename' size='50' />
<input type='submit' value='Upload' />
</form>
<br />
</div>
_END;

if (isset($_FILES['filename'])) {
$name = "videos//" . $_FILES['filename']['name'];
if (move_uploaded_file($_FILES['filename']['tmp_name'], $name)) {
    include 'DO_Files.php';
    $file = new DO_File();

    $type = $_FILES['filename']['type'];
    $size = $_FILES['filename']['size'];

    $file->FileName = $name;
    $file->FileSize = $size;
    $file->Type = $type;

    if ($file->save()) {
        $fileId = $file->getFileIdFromName();

        if ($fileId) {
            echo "<h1> Thank you </h1><p>Image stored "
            . "successfully</p>";
            echo "<p>Upload image '$name'</p><br /><img src='$name' "
            . "height='200' width='200'/>";
            echo '<br><a href="Display.php?id=' . $fileId .
            '">Display image ' . $file->FileName . '</a>';
        } else
            echo '<p class="error">Error retrieving file '
            . 'information</p>';
    }
    else {
        echo '<p class="error"> Oh dear. There was a database '
        . 'error</p>';
    }
} else {
    $error_array = error_get_last();
    echo "<p class='error'>Could not move the file</p>";
    if (!is_null($error_array)) {
        foreach ($error_array as $err) {
            echo $err;
        }
    }
}
}   

check this

$name = "videos/" . $_FILES['filename']['name'];

The destination folder for your video looks strange.

In most cases a // in no problem, but it would be better to use only one slash to divide folders.
I also would recommend to use a full path, if videos is next to our PHP file, you can write:

 $name = __DIR__.'/videos/'.$_FILES['filename']['name'];

And you have to make sure that PHP has the rights to write in the folder videos! (You can check this with is_writable())

On windows you maybe have to write \\ (2 backslash) instead of /.